400B4401

Error 400 OKI B4401: Main Motor Failure

The OKI B4401 error 400 is a mechanical failure notice related to the main motor or gear system. It occurs when the toner or drum drive mechanism encounters a blockage, preventing normal rotation. This is a compact office printer where internal cleanliness is vital to prevent these types of motor jams.

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Common causes

  • 1Physical jam in the drum unit.
  • 2Worn-out toner gears causing friction.
  • 3Foreign object in the print area (clips, staples).
  • 4Electronic failure in the main motor.

Solutions

Quick Diagnosis

The error 400 is often accompanied by a clicking or grinding sound. If the printer stops shortly after attempting to print, an obstruction in the drum area is the most likely cause.

Step-by-step Solution

  1. Extraction: Open the cover, remove the toner and drum.
  2. Inspection: Look for paper scraps or clips in the roller area.
  3. Manual Check: Rotate the drum gears gently to verify they move freely.
  4. Testing: Reinstall the assembly and turn the unit on.

Prevention and Maintenance

Do not allow toner to accumulate in the development area. Monthly compressed air cleaning keeps gears moving freely without extra wear. Genuine consumables are key to avoiding mechanical errors.

When to Call a Technician

If the motor still won't turn and the components look clean, the main motor clutch may have jammed or broken.

Ficha técnica del equipo

  • Technology: Laser printer
  • Speed: 30 ppm
  • Connectivity: USB/Parallel
  • Consumable: B4400 series toner
  • Maintenance: Monthly cleaning
  • Official Drivers / Firmware

Steps to follow

  1. 1

    Open

    Open the top cover and remove the toner.

  2. 2

    Inspect

    Look for paper scraps or debris in the drum area.

  3. 3

    Reinstall

    Place the toner and close the cover to test.

Frequently asked questions

This error signals that the main motor has encountered excessive mechanical resistance and cannot rotate.

Never; if the toner or drum doesn't fit, there is an obstruction that you might break.

Always use genuine B4400 series consumables to ensure smooth operation.

Cleaning rollers periodically and using dust-free paper helps significantly.

Error 400 OKI B4401: Main Motor Failure | Vimazdev